Five Oaks Consulting:


Tosca Bruno-van Vijfeijken
Principal Consultant
Five Oaks Consulting

Work smarter, more effectively, and with more impact

Leaders of International NGOs partner with Five Oaks Consulting to help them achieve maximum effectiveness. Our expertise is bringing out the best in mid- to large-size, global INGOs through skillful change management, cutting edge leadership development and organizational effectiveness related practices.

Experience and knowledge for high impact organizations

With Five Oaks Consulting, you benefit from access to a full range of professional expertise that includes decades of international development and social justice experience. We understand the views, mindset and culture of transnational NGOs, and other forms of (Civil Society Organizations) CSOs  and what it takes to optimize their organizational assets.

Our practice as thought leaders includes vast experience working inside and with think tanks, the United Nations, the World Bank, and academia, along with a wide range of NGOs.

Make the most of your organization

Each challenge we take on for our clients is grounded in rigorous, empirically researched frameworks and strategies that have been thoroughly investigated, tested and validated across the public (government and non-government) and private sectors. Our partners especially appreciate our reputation for honesty and integrity.


Tap into our deep knowledge of all aspects of NGO and CSO operations, including internal culture and worldviews.


Benefit from our broad experience as hands-on players across humanitarian, educational, health, public policy, social, human rights, environmental, and other not for profit arenas.


Our tried and true approach is built on a solid foundation of research-based methods. Leverage our deep understanding of the particular challenges and opportunities you face every day.

Our expertise includes

  • Organizational effectiveness

  • Change management and leadership

  • Leadership development

  • Organizational culture assessment and change

  • Organizational diversity and inclusion strategies

  • Organizational evaluation and learning approaches

  • Gender and leadership

  • Feminist leadership

Meet Tosca

Tosca Bruno-van Vijfeijken, Principal Consultant

Tosca Bruno-van Vijfeijken has dedicated her three-decade career to international development and civil society issues. For nearly 16 years she managed, and eventually led the Transnational NGO Initiative (TNGO Initiative) at the Maxwell School of Citizenship and Public Affairs at Syracuse University, USA, where her focus was on the governance, leadership and effectiveness of international civil society organizations.

Tosca has done extensive work with mid-sized to large INGOs helping to direct customized leadership development, including executive coaching. Her work extends to change leadership and management, including organizational level evaluations.

Learn More about Tosca >>

Clients we have worked with